US10657979B2 - Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information - Google Patents

Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information Download PDF

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US10657979B2
US10657979B2 US14/811,722 US201514811722A US10657979B2 US 10657979 B2 US10657979 B2 US 10657979B2 US 201514811722 A US201514811722 A US 201514811722A US 10657979 B2 US10657979 B2 US 10657979B2
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signal
side information
parametric representation
selection side
generating
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US20150332701A1 (en
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Frederik Nagel
Sascha Disch
Andreas NIEDERMEIER
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/26—Pre-filtering or post-filtering
    • G10L19/265—Pre-filtering, e.g. high frequency emphasis prior to encoding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
    • G10L21/0388—Details of processing therefor
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/002—Dynamic bit allocation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
    • G10L25/69—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for evaluating synthetic or decoded voice signals

Definitions

  • FIG. 5 illustrates a advantageous implementation of the signal estimator controlled by a voice activity detector or a speech/non-speech detector
  • the feature extractor can also operate or extract a feature from the encoded core signal.
  • the encoded core signal comprises a representation of scale factors for frequency bands or any other representation of audio information.
  • the encoded representation of the audio signal is representative for the decoded core signal and, therefore features can be extracted.
  • a feature can be extracted not only from a fully decoded core signal but also from a partly decoded core signal.
  • the encoded signal is representing a frequency domain representation comprising a sequence of spectral frames. The encoded core signal can, therefore, be only partly decoded to obtain a decoded representation of a sequence of spectral frames, before actually performing a spectrum-time conversion.
  • the feature extractor 104 can extract features either from the encoded core signal or a partly decoded core signal or a fully decoded core signal.
  • the feature extractor 104 can be implemented, with respect to its extracted features as known in the art and the feature extractor may, for example, be implemented as in audio fingerprinting or audio ID technologies.
  • FIGS. 9 to 11 Reference is made to FIGS. 9 to 11 .
  • FIG. 8 illustrates an exemplary representation of the encoded input signal.
  • the encoded input signal consists of subsequent frames 800 , 806 , 812 .
  • Each frame has the encoded core signal.
  • frame 800 has speech as the encoded core signal.
  • Frame 806 has music as the encoded core signal and frame 812 again has speech as the encoded core signal.
  • Frame 800 has, exemplarily, as the side information only the selection side information but no SBR side information.
  • frame 800 corresponds to FIG. 9 or FIG. 10 .
  • frame 806 comprises SBR information but does not contain any selection side information.
  • frame 812 comprises an encoded speech signal and, in contrast to frame 800 , frame 812 does not contain any selection side information. This is due to the fact that the selection side information are not necessary, since any ambiguities in the feature extraction/statistical model process have not been found on the encoder-side.
  • FIG. 12 illustrates an encoder for generating an encoded signal 1212 .
  • the encoder comprises a core encoder 1200 for encoding an original signal 1206 to obtain an encoded core audio signal 1208 having information on a smaller number of frequency bands compared to the original signal 1206 .
  • a selection side information generator 1202 for generating selection side information 1210 (SSI—selection side information) is provided.
  • the selection side information 1210 indicate a defined parametric representation alternative provided by a statistical model in response to a feature extracted from the original signal 1206 or from the encoded audio signal 1208 or from a decoded version of the encoded audio signal.
  • the encoder comprises an output interface 1204 for outputting the encoded signal 1212 .
  • the encoded signal 1212 comprises the encoded audio signal 1208 and the selection side information 1210 .
  • the selection side information generator 1202 is implemented as illustrated in FIG. 13 .
  • the selection side information generator 1202 comprises a core decoder 1300 .
  • the feature extractor 1302 is provided which operates on the decoded core signal output by block 1300 .
  • the feature is input into a statistical model processor 1304 for generating a number of parametric representation alternatives for estimating a spectral range of a frequency enhanced signal not defined by the decoded core signal output by block 1300 .
  • These parametric representation alternatives 1305 are all input into a signal estimator 1306 for estimating a frequency enhanced audio signal 1307 .
  • the metadata extracted by the metadata extractor 1400 is discarded in the encoder and is not transmitted in the encoded signal 1212 . Instead, the selection side information 1210 is transmitted in the encoded signal together with the encoded audio signal 1208 generated by the core encoder which has a different frequency content and, typically, a smaller frequency content compared to the finally generated decoded signal or compared to the original signal 1206 .
  • a further embodiment according to the invention comprises an apparatus or a system configured to transfer (for example, electronically or optically) a computer program for performing one of the methods described herein to a receiver.
  • the receiver may, for example, be a computer, a mobile device, a memory device or the like.
  • the apparatus or system may, for example, comprise a file server for transferring the computer program to the receiver.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Quality & Reliability (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Stereophonic System (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
US14/811,722 2013-01-29 2015-07-28 Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information Active 2036-01-20 US10657979B2 (en)

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US14/811,722 US10657979B2 (en) 2013-01-29 2015-07-28 Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information
US15/668,473 US10186274B2 (en) 2013-01-29 2017-08-03 Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information
US15/668,375 US10062390B2 (en) 2013-01-29 2017-08-03 Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information

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US14/811,722 US10657979B2 (en) 2013-01-29 2015-07-28 Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information

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EP (3) EP2951828B1 (ko)
JP (3) JP6096934B2 (ko)
KR (3) KR101775084B1 (ko)
CN (3) CN105103229B (ko)
AR (1) AR094673A1 (ko)
AU (3) AU2014211523B2 (ko)
BR (1) BR112015018017B1 (ko)
CA (4) CA3013766C (ko)
ES (3) ES2725358T3 (ko)
HK (1) HK1218460A1 (ko)
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MY (1) MY172752A (ko)
RU (3) RU2627102C2 (ko)
SG (3) SG11201505925SA (ko)
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